[Yaina]

It's one solution to a problem. Which is that the results of tests are not strictly measuring how well the students understood the subject matter, but are heavily influenced by the quality of the rest and course as a whole.

That is generally hard to measure and frankly there is little accountability for bad courses. At the worst end you have bad profs who are proud of high failure rates because they don't understand it as a failure to teach but as a seal of quality how rigorous their standards are complex the subject matter is that they are teaching.

Not that grading on a curve solves any of that, but it eases the burden on students.